I suggestied an idea to my wife and she loved it. We'll lay down a blanket on the living room floor to picnic, and I will grill Bistecca a la Fiorentina using the fireplace. What would be the best way to do this? I plan on using a porterhouse.The tough part is that there isn't a chimney for our gas fireplace, but the gas logs are designed for that. What would be the best way to cook this? Also, if anyone has made this before, is there anything I should be prepared for?

If you have a vent free fireplace, I wouldn't cook on it. I have 2 of them, and I'm always cautious of what fumes are still being put off by them. I think some places don't even allow them. I'd at least call a place that deals with them before trying to cook using them.